Segmentation is important in annelids as an aid in:
A. respiration.
B. reproduction.
C. movement.
D. sensation.
E. eating
C
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What nonsurgical treatment for cervical cancer is uses extreme cold to destroy the abnormal cells?
A. Hysterectomy B. Lumpectomy C. Mastectomy D. Cryotherapy
Newborn animals that closely resemble the adults of their species undergo ________ development
Fill in the blank(s) with correct word
The minimum viable population is the
A) smallest number of males needed to maintain a population. B) number of organisms that can reproduce in a population. C) number of organisms that can be spread over a fragmented habitat. D) number of organisms produced by an inbred population. E) smallest number of organisms capable of maintaining a population.
Many scientists believe that we are in a global mass extinction caused by human activity. What is conclusive evidence for this assessment?
a. Current estimated extinction rates on islands are 10,000 times greater than background extinc-tion rates. b. Current estimated extinction rates on continents are 10,000 times greater than background ex-tinction rates. c. One genus of tropical butterflies lost 90% of its species during the past 30 years. d. Converting old-growth forest into agricultural fields causes dramatic losses in songbird diver-sity in the converted areas.